Rotor System Flashcards
1
Q
Swashplate
Assembly
A
- Mounted on the slider shaft
- Transmit control
movements to the rotors by
either manual inputs or
DAFCS inputs - Can be both tilted and
moved vertically.
Movement transferred to
the rotor blades through
pitch-change links and
pitch-varying housings on
the rotor head. - The swiveling, pivoting,
and LCT actuators all make
inputs to the swashplate
assemblies - Stationary Ring: mounted
on a spherical bearing (uniball)
and allows swashplate
to tilt in any direction. - Rotating ring: mounted on
the ball bearing assembly
and allows the ring to rotate - Ball bearing assembly:
installed between the
rotating and stationary
rings. - Ball Spherical Bearing
(Uni-Ball): stationary rung
mounted to it and allows
swashplate to tilt.
2
Q
Slider Shaft
A
- The Fwd slider shaft is
mounted to the fwd
transmission and the aft
slider shaft is mounted to
the aft vertical shaft - Used to keep the swashplate
vertically aligned. - As thrust lever changes are
made, swashplate will move
up/down the slider shaft
3
Q
Longitudinal Cyclic Trim Actuators (LCTs)
A
- Provides cyclic feathering
input into the rotor system
using commands from the
DAFCS. - Maintain A/C at a level
attitude, based on airspeed
and altitude. - When on ground, the WOW
switches drive LCTs to
ground
4
Q
Fixed Link
A
- Measures the stress on each
rotor system and displays
info on the CGI. - The higher indication from
the two fixed links (1 on
each rotor) is displayed
5
Q
Drive Collar and Drive Arm Assembly
A
- The fwd drive collar is mounted to the fwd transmission output shaft.
- The aft drive collar is mounted to the top of aft vertical shaft.
- Drive arm assembly transmits rotational torque to the rotating ring of the swashplate
6
Q
Pitch Change
Link
A
- Mounted to the rotating ring of the swashplate and the pitch horn on the rotor head
- Provide direct input for pitch changes to the rotor hub
7
Q
Weather
Protective Cover
A
- Keeps rain, ice, and snow out of the aft pylon/fwd transmission area.
8
Q
Fixed Droop Stops
A
- Limit the amount of
flapping the pitch shafts and
rotor blades can flap up or
down. - Installed to the bottom of
the pitch varying shaft,
below the horizontal hinge
pin
9
Q
Centrifugal droop
stops
A
- Provide an additional limit
to the drooping of the aft
rotor blades during low NR
and shutdown.
10
Q
Blade Shock
Absorbers
A
- Fully articulated rotor
system which allow the
blades to lead, lag, feather,
and flap. - 6 major components are:
o Rotor Hub
o HHP
o Tie Bar
o Pitch Varying Shaft
o Pitch Varying
Housing
o VHP
11
Q
Rotor Head
A
- Fully articulated rotor
system which allow the
blades to lead, lag, feather,
and flap. - 6 major components are:
o Rotor Hub
o HHP
o Tie Bar
o Pitch Varying Shaft
o Pitch Varying
Housing
o VHP
12
Q
Rotor Hub
A
- Attaches to an output shaft
- Provides a mounting base
for the components of the
rotor head - Each hub is master splined
for ease of installation
13
Q
Horizontal Hinge
Pin (HHP)
A
- Attaches the Pitch varying
shaft to the rotor hub. - Allows for flapping
14
Q
Tie Bar
A
- Laminated steel bar
allowing for flexibility and
twisting while providing
high tensile strength. - Passes through the HHP and
connects the pitch varying
housing to the pitch varying
shaft - Allows for change in pitch
of the rotor blades
15
Q
Pitch Varying
Shaft
A
- Mounted to the HHP
- Provides the mount for the
Pitch varying housing
16
Q
Pitch Varying
Housing
A
- Mounted on and attached to
the pitch varying shaft by
the tie bar. - Provides mounting point for
pitch change links, damper,
rotor blade, and lightening
protection cables
17
Q
Vertical Hinge Pin (VHP)
A
- Attaches the rotor blade to
the pitch-varying housing - Allows the blade to lead
and lag.
